Fix order of parameters in exception message formatter. (#81718)

diff --git a/src/libraries/System.Text.Json/src/System/Text/Json/ThrowHelper.Serialization.cs b/src/libraries/System.Text.Json/src/System/Text/Json/ThrowHelper.Serialization.cs
index f99de65..6ba9bb0 100644 (file)
--- a/src/libraries/System.Text.Json/src/System/Text/Json/ThrowHelper.Serialization.cs
+++ b/src/libraries/System.Text.Json/src/System/Text/Json/ThrowHelper.Serialization.cs
@@ -598,7 +598,7 @@ namespace System.Text.Json
         [DoesNotReturn]
         public static void ThrowJsonException_UnmappedJsonProperty(Type type, string unmappedPropertyName)
         {
-            throw new JsonException(SR.Format(SR.UnmappedJsonProperty, type, unmappedPropertyName));
+            throw new JsonException(SR.Format(SR.UnmappedJsonProperty, unmappedPropertyName, type));
         }
 
         [DoesNotReturn]